[Subclause (1)(a)(i) and Clause (b)] To limit the probability of the accumulation and subsequent ignition of vapour near buildings by outdoor ignition sources, which could lead to harm to persons.
[Subclause (1)(a)(ii) and Clause (b)] To limit the probability of the release of vapour in--or the re-entry of vapour into--the building, which could lead to the accumulation and subsequent ignition of vapour, which could lead to harm to persons in the building.
[Subclause (1)(a)(iii)] To limit the probability that vapour released through underground tank vent pipes will come in contact with ignition sources likely to be present near dispensers, such as motor vehicles being refuelled, which could lead to the ignition of the vapour, which could lead to harm to persons.